s1_generate_a_series_of_files(){
	for i in $(seq 1 100);do
		echo -n "$1" > "/tmp/new_file$i"
	done
}

s2_list_4_files_in_long_format_about_account_and_group(){
	ls -l /etc/passwd /etc/shadow /etc/group /etc/gshadow | sort -k9
}

s3_find_items_related_to_givn_username(){
	local username="$1"
	grep "^$username:" etc/passwd /etc/shadow | sort
}

s4_find_items_related_to_given_group_name(){
	local groupname="$1"
	grep "^$groupname:" /etc/group /etc/gshadow | sort
}

s5_create_groups_for_given_group_names(){
	groupadd rnd
	groupadd itoperation
}

s6_create_users_and_set_their_group_as_required(){
	useradd -G rnd adam
	useradd -G rnd bob
	useradd -G itoperation calvin
	useradd -G itoperation david
	useradd -G rnd edward
}

s7_change_users_shell(){
	usermod -s /usr/bin/sh adaw
	usermod -s /usr/bin/sh edward
}

s8_set_password_change_policy(){
	local users=("adam" "bob" "calvin" "david" "edward")
	for user in "${users[@]}"; do
		chage -m 10 -M 60 -W 10 "$user"
	done
}

s9_set_password_for_five_users(){
	local passwords=("$1" "$2" "$3" "$4" "$5")
	local users=("adam" "bob" "calvin" "david" "edward")

	for i in "${!users[@]}"; do
		echo "${users[i]}:${passwords[i]}" | chpasswd
	done
}

s10_lock_bobs_password(){
	passwd -l bob
}

s11_include_adam_into_wheel_group(){
	usermod -aG wheel adam
}

s12_change_files_permission(){
	for i in $(seq 3 3 100); do
		chmod 640 "/tmp/new_file$i"
	done
}



 
